Its difficult to explain, but fairly easy to do. I will state that Vauxhall says that the gear box oil dosen't need to be touched ever in the cars lifetime. If you are still intrested and haven't found a way to do this then e-mail me asking about it. Its only because this will be a long answer and theres no point in answering it if you have found out how to do it'
trit666@hotmail.com
Kind Regards
Tristan Hanwell, March 2006
